Attachment for stoves or furnaces.



No. 640,778. Patented 1am 9, [900.-

H. H. KORTHAUER.

TTACHMENT FOR STUVES 0R FURNACES.

(Application med' Apr. 29, 1899.)

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No. 640,778. Patented la-n. 9, 1900. H. H. KURTHAUE'R.

ATTACHMENT FDH STOVES 0R FURNAGES.

(Applicatibn led Apr. 29, 1899.)

42 Sheets-Sheet 2.

(nu Model.)

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UNITED STATES PATENT Ortisei HERMAN H. KORTHAUER, OF BENSENVILLE,ILLINOIS;

ATTACHMENT FOR STOVES OR FURNACES.

SPECIFICATION forming part of Letters Patent No. 640,778, dated January9, 1900; Application filed April 29, 1899. SerallNo. 715,024. (Nomodel.)

lb all whom it may concern:

Be it known that LHERMAN H. KORTHAUER, a citizen of the United States,residing at Bensenville, in the county of Du Page and State of Illinois,have invented certain new and useful Improvements in Attachments forStoves or Furnaces; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to stoves and furnaces; and it consists in certainnovel features of construction and combination of parts, the preferredembodiment or materialization of which will be hereinafter fullydescribed, and illustrated in the accompanying drawings, made a part ofthis application.

The object of my invention is to more effectively utilize the heatWithin a stove or furnace than is now common. This result I accom plishby practically increasing the radiating-surface presented to the actionor influence of the fire, which I accomplish in a very simple, cheap,though thoroughly efficient manner. i

A further object attained by the use of my invention is the utilizationor taking up of the lower and colder strata of air and passing itthrough or over heated surfaces, and thereby raising the temperaturethereof to an agreeable point, thus insuring a complete circulation ofair in a room and that the air nearest the floor will be practically ofthe same temperature as that nearest the ceiling.

While I have illustrated and shall describe in the followingspecification the preferred construction and arrangement of parts, itWill be understood that I desire to comprehend the substantialequivalent thereof, and I do not therefore wish to be coniined strictlyto the exact showing I have made. Y

In the accompanying drawings, Figurerl is a vertical section of anordinaryheating-stove provided with my air-heating attachment. Fig. 2 isa top plan view of the attachment removed. Fig. 3 is a perspective Viewof an ordinary cooking stove or range, showing my attachment in theposition usually occupied by a water-heating boiler. Fig. t is alongitudinal section of my attachment and the top of a stove, showingthe relative position of said parts to each other when in their cop#erative positions.

In' order to conveniently referto the several 5 5 parts of my inventionand such cooperating features as may be necessary to illustrate the usethereof, designating-numerals will be employed, of which l indicates thebody-section or nre-pot of an ordinary stove having the usual upperportion or magazine extension 2, the fuel-door 3, and the flueconnection 4, all of said parts being substantially of the usualconstruction.

Within the magazine portion or extension 2 I mount and removably securemy improved air-heating attachment, which consists of the exterior bodyor cylinder 5 and the interior cylinder 6, both of said parts beingpreferably cylindrical, though other form of outline may be adopted, itbeing understood that the interior tube or cylinder 6 is of considerablyless diameter than the outer casing or cylinder 5.

Fitting tightly around or permanently se'- cured to the lower end of theinner casing or tube 6, which is left permanently open at its lower end,is the collar 7, which extends out- Ward and is permanently attached tothe lower edge of the outer casing 5, thereby inclosing and supportingthe inner tube. Immediately above the collar 7 I secure to the innerwalls of the outer casing 5 and to the outer Walls of the inner casing 6the perforated collar or air-commingling plate 8, and connecting withthe annular chamber 9 thus provided between the collar 7 and the plate 8is the air-delivering pipe or tube 10, which extends outward throughasuitable aperture provided in the wall of the stove and thence downwardto a point near the floor. In Fig. l it will be seen that this pipe isshown as extending out of the body portion of the stove and thencedownward at right angles, though itis thought that a preferable and moresightly construction would perhaps dispose said tube more closelyagainst the exterior Wall of the stove.

The upper edge of the exterior casing 5 may be provided with acontinuous flange or with anchoring-ears ll, by means of which thedevice maybe secured in position by stove-bolts 12, passing through thetop of the stove and properly secured by nuts in the usual way.

IOO

The inner casing 'or tube 6 may be employed as the throat of a magazine,through which coal maybe introduced to the lire in the usual manner, inwhich case the lid or cap 13 should be removably secured upon the upperend of said tube and provided with a suitable handle, (not shoivm)whereby said lid or cap may he readily removed and replaced; but it isthought that better results would be reached by introducing the fuelthrough a suitable opening, as the door 3. i

It will be observed that since the interior casing 6 is of much lessdiameter than the outer easing 5 there will he an annular chamber orspace 14 around said inner casing, which I utilize to locate thespirally-arranged plates 15, which are multiplied in number accordin gto the size of the iiues to be form ed. By the arrangement illustratedin Fig. 2 it will be observed that between said plates Will be formed acontinuous spirally-disposed flue or opening 16, aiording agreatly-extended line of travel for the air received through the tube10. By suspending my air-heating device Within the body of the stoveimmediately over or under the influence of the lire the ame and heatwill not only Wrap around the exterior easing 5, but will also extendfreely upward through the open end of the inner casing 6, and in orderto prevent a dead-air chamber from being formed Within the inner casingI provide the laterally-extending duct 17, designed for the escape ofaccumulated gases, smoke, the., thereby insuring a more perfectcirculation of heat and an incident increase in temperature of the airpassing upward through the spiral lue 16 and thence upward through anopening provided in the usual cap or hood 18 of the stove.

By the arrangement of the parts which l have just described andillustrated the hot air Within the stove is more effectively utilizedthan `Would be possible without such means, inasmuch as the onlyradiation of heat from a stove as now constructed takesV place from theexterior surface thereof, the interior air, though of highesttemperature, being l permitted to escape through the chimney Withoutdelivering its j ust portion of caloric. The advantage resulting fromforming the dues spirally Will-at once be appreciated, inasmuch as uesof great length may be disposed Within the upper portion of a stoveWithout the necessity of so extending or increasing the length of theexterior casing surrounding said lines as to in any Way prevent readyaccessibility to the fire-pot or obstruct the action of the dame, itbeing obvious that the length of the iiues is determined by the degreeof spirality of the plates 15.

lt is found in practice that since the exterior walls of 'the fines areheated to a high de grec the air will move rapidly upward through thesame, and the draft thus induced will cause the cold air near the doorto he taken up and rapidly passed through said dues, thereby utilizingto the fullest extent the incedric terior heat of the stove, whichivould other- `:vise inipotently pass into the chimney, the result beinggreat Wastefulness of the utilization of the fuel.

lt is now common to extend the Iiue or pipe of the stove through theceiling of the room in which the stove is located and thence up- Wardthrough the door of the room above, when a drum is attached to said pipeand connection made with the drum and the chimney, the result being anunsightly and cumbrons device. By the use of my air-heating appliancethe cumbrcus drum and obstructing pipe may be entirely dispensed withand in lieu thereof a neattuhe, of tin or the like, may be arranged toextend upward from the opening in the hood 18 through the ceiling andinto a register provided in the licor of the room above, thus insuringthat said roomwill be thoroughly though economically heated.

I am aware that it is common to arrange spirally-disposed dues for thepurpose of con'- ducting the smoke, heat, and other products ofcombustion over or in contact with the maximum amount ofradiating-surface; but this plan is very objectionable andunsatisfactory, inasmuch .as soot, ashes, and the like will so greatlyaccumulate that the heat will have little etect upon the surfaceintended to be heated, but Will pass into the chimney Without muchbenefit to the room in which the stove is located.

While i have illustrated my air-heating appliance as used in connectionwith an ordinary heating-stove in which coal is employed as fuel, itwill be understood that it will be desirable for use upon any variety ofstove or furnace and, in fact, will be especially desirable as a furnaceattachment, in which case ICO the number of devices, each havingspirallydisposed lines, should be multiplied according to the size ofthe furnace above the fire-pot, it being clear that a half-dozen of suchdevices, more or less, as illustrated in Fig. 2, could be disposedadjacent to each other Within the upper portion of a furnace-body andthere secured in any suitable Way, as by arms or brackets secured to theinterior surface of the furnacewvall, each of the interior tubes of eachdevice being properly ventilated with a suitable duct corresponding tothe duct 17. Where a number of airheating devices are thus groupedtogether in a furnace-body, it will be desirable to provide a dome atthe top of the furnace, which will be a common delivery-point for all ofthe devices grouped together below, and it is obvious that by providingsaid dome with a number of apertures the heat therein could be readilydelivered to all of the rooms of a building, and since the air passeswith considerable velocity through the spiral ilues, owing to theintense heat to which it is subjected, the air is actually forcedthrough the delivery-pipes into another part of the building, evenagainst the direction of the prevailing wind, which is not possible withfurnaces as now constructed.

I prefer to deliver the cold air as it comes through the pipe 10 intothe annular chamber 9 instead of passing it directly into the flues,since the air will be temporarily held in check within said chamber, andthereby initially heated before passing upward, thereby being evenlydistributed through the apertures provided in the plate 8, thus insuringthat each of the lues will receive its proper quota of air and that thecold air cannot immediately and rapidly leave the flues without beingraised to the proper temperature, and, furthermore, by holding the coldair in check within the annular chamber 9 the bottom'of the device isprevented from becoming warped or rapidly burned ont and ruined.

In addition to the great advantages arising as a result in the use of myimproved air-heating apparatus as applied to heating stoves and furnacesit will also be found to be very desirable and important, with slightmodifications in the construction thereof, for use upon cooking-stoves,as illustrated in Figs. 3 and 4, since a cooking-stove, as a rule, isdesigned only with reference to its cooking capacity, and as a resultthe average kitchen is not well heated, especially near the floor, andit is obvious that by the use of my invention the cold air maybe drawnupward through the pipe 19, which corresponds to the pipe l0 in Fig. 2,and thence taken under a perforated diaphragm or collar corresponding tothe collar S, and thence fed upward through such perforations into aseries of lues 20, which are increased in number, as desired.

In adapting my air-heating device for use upon cooking-stoves I preferto provide an exterior casing 2l of elongated or oval form correspondingsomewhat in outward appearance to an ordinary washboiler, it beingunderstood that the interior casing 22, corresponding to the interiorcasing or tube 6, is of corresponding shape with the said exteriorcasing, thereby providing a continuous annular chamber between the outercasing 2l and the inner casing 22, in whichI dispose thespirally-arranged plates or flanges 23, corresponding in function oroflice with the plates 15 in Fig. 2. To the upper edge of the casing 21,which corresponds to the exterior casing 5 in Fig. 2, I attach orintegrally form therewith the housing or shell 24:, which is inclinedoutward atits lower end and is designed to it within the usual openingof a stove after the lids and X-pieces have been removed or may be ofsufficient extent to entirely cover said opening, and thereby preventthe escape of gas or smoke. By this arrangement it will be seen that Iform around the exterior casing proper, 2l, and said outer shellorhousing 24 an annular chamber 25, up into which the heat and ame mayextend, thereby enabling the heat to reach upon the outer sides of theiiues, while the inner sides of said lues are also affected by the flameand heat as it extends upward in the tube or casing 22, it beingunderstood that the permanently-secured cap 26 is attached to the upperend of said inner casing.

By the construction which l have just described and which isfully-illustrated in Figs. 3 and 4 it will be appreciated that I haveprovided a simple attachment which may be readily applied to use upon acooking-stove and as promptly removed therefrom when not in use, therebyinsuring that the cold air nearest the floor will be taken up and heatedand the temperature of the room thereby rendered more agreeable. It willbe readily appreciated that various modifications may be made by meansof which my air-heating device will be rendered applicable to almost anystove or arranged to fit upon almost any variety of stove, furnace, orother source of heat and that it may be made a permanent part of thestove or furnace or manufactured as a simple article complete withinitself and ready to be placed over the source of heat.

My invention may be readily formed of any metal suitable for the purposeand may be built up of several separate pieces of sheet metal, or mostof the parts thereof may be cast or integrally formed in one piece,thereby making it possible that the cost of manufacture may be reducedto a minimum point.

It is clear that various simple modifications of the means I have hereindescribed and illustrated may be employed by which the heat may beconveyed to any or all of the rooms in a building from a simpleheating-stove of ordinary construction-as, for instance, by providing adrum adapted to it over the top of the stove into which the heat fromthe flues is delivered and thence conveyed by suitable pipe connectionsto the points where it is desired to use the same.

By disposing my heating appliance within the body of the stove thedirect effect of the heat comes in contact with the sides of the dues,thereby greatly increasing the surface of radiation, and since no soot,ashes, or other products of combustion can collect upon any of the partsof my heating appliance use does not effect the efficiency thereof.

By increasing the number and length of the flues the air is confinedwithin a smaller space and will be heated more quickly and raised to amuch higher degree of temperature than if the flues were larger, andeven though the flues are of great length and of slight pitch or upwardinclination the high degree of temperature to which the air is raisedwill insure that there will be a vigorous or rapid draft through thesame and that when the air is released at the top of the stove it willbe much more perfectly heated than if passed more directly through thestove, as would be the case if the iiues were of larger extent and morerapid pitch.

It is thought that the advantages enumerated and others will be fullyappreciated and understood from the foregoing specification, andbelieving that the construction has been made entirely clear I will nowset forth what IOO IIO

e' cedere I oleiln as new and desire to secure by Leiters Patent.

1. As en attachment for stoves, furnaces, or the like, air-heating finesspirali y disposed around an inner casing open et its lower end andclosed at its top; an exterior casing inclosing said fines; a colla-rconnecting the lower open end of the inner tube end the lower end o theexterior tube; e perforated flange or disk fitting around said innertube and located above seid coller whereby e. cold-ain receiving`chamber will be formed below seid lines and ni eens to deliver the coldnir in said chamber, es specified and for the purpose set forth.

2. As an improvement in air-heating eppliences for furnaces, stoves, theherein-described device consisting` of en inner and outer shell orcasing, the former being closed at the top and open at the bottom; eiienge extending from the open end of said inner casing to the lower endof the outer casing; e perforated partition secured to the exterior wallof the inner casing and the interior well of the outer casing andlocated above seid iiange; spirnlly disposed plates extending,` aroundthe inner easing end occupying' the zinnnlar chamber between seidcesings g means to secure the outer easing in piece and a pipe extendingfrom the chamber below seid perforated partition outside of the stove toa, point near the door whereby the cold nir will be gathered anddelivered through the spiral fines provided by seid plates. in themanner speciiied end for the purpose set forth.

3. As an improvement in air-heating epi pliances for furnaces, stoves,the combination With e stove-body, of e spirally-erranged due disposedWithin the body of the stove or iurnace immediat-ely above the fire-pot5 suitable casings designed to inclose seid fines whereby the dame andheat may pass upon both sides thereof, and an air-pipe extending from c,

peint near the door upward into the stove in communication with seidfines, and e perforated disk adapted to temporarily check the cold eirbefore entering the dues, whereby said sir will be evenly distributed inthe menner specified and for the purpose set forth.

L As e. nenT article of manufacture, the herein-described einheatingdevice consisting of en outer and inner casing, the letter open only atthe bottoni and the former open only et the top; c. perforated flange ordisk separating the ann nier chamber formed between seid cesings intotwo compartments; e. spirellynrrenged plate or plates secured to theexterior Well of the inner casing and the interior Wall of the exteriorcasing, whereby an inclined flue or dues may be formed Within seidannular chamber; e duct or tube extending from the closed upper end ofthe inner tube outward through the spirally-disposed fines and exteriorcasing, and a. pipe coininnnieating with the compartment below saidperforated collar and extending to a point neer the door, all combinedes speciiied and for the purpose set forth.

5. An einheating appliance, consisting of a. psir of shells or cesings,one fitting Within the other and thereby forming an annular chamberclosed at the bottom and open at the top; a. tightly-ntting cap 'for theupper Vend of the inner chamber; spirellydisposed anges or platesdisposed in seid annular chamber; o perforated flange or plete locatedbelor:r seid dues, whereby the cold air es received will be evenlydistributed to the dues and ineens to hold seid device in an' adjustedposition, es speciied end for the purpose set forth.

in testimon Whereot I affix my signature in presence of two witnesses.

HERMAN H. KORTHAUER. Witnesses:

H. W. F. BrinrnLLs, M. E. LESTER.

